From: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
[ Upstream commit e1f956a804df9074fb5de557563d153ae25252e7 ]
____cacheline_aligned is insufficient guarantee for non-coherent DMA.
Switch to the updated IIO_DMA_MINALIGN definition.
Update comment to reflect that DMA safety may require separate
cachelines.
Fixes: cbab791c5e2a5 ("iio: accel: add ADXL367 driver")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Cc: Cosmin Tanislav <demonsingur@xxxxxxxxx>
Acked-by: Nuno Sá <nuno.sa@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20220508175712.647246-5-jic23@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/iio/accel/adxl367.c | 2 +-
drivers/iio/accel/adxl367_spi.c | 8 +++++---
2 files changed, 6 insertions(+), 4 deletions(-)
diff --git a/drivers/iio/accel/adxl367.c b/drivers/iio/accel/adxl367.c
index 62960134ea19..d680bec05efc 100644
--- a/drivers/iio/accel/adxl367.c
+++ b/drivers/iio/accel/adxl367.c
@@ -179,7 +179,7 @@ struct adxl367_state {
unsigned int fifo_set_size;
unsigned int fifo_watermark;
- __be16 fifo_buf[ADXL367_FIFO_SIZE] ____cacheline_aligned;
+ __be16 fifo_buf[ADXL367_FIFO_SIZE] __aligned(IIO_DMA_MINALIGN);
__be16 sample_buf;
u8 act_threshold_buf[2];
u8 inact_time_buf[2];
diff --git a/drivers/iio/accel/adxl367_spi.c b/drivers/iio/accel/adxl367_spi.c
index 26dfc821ebbe..118c894015a5 100644
--- a/drivers/iio/accel/adxl367_spi.c
+++ b/drivers/iio/accel/adxl367_spi.c
@@ -9,6 +9,8 @@
#include <linux/regmap.h>
#include <linux/spi/spi.h>
+#include <linux/iio/iio.h>
+
#include "adxl367.h"
#define ADXL367_SPI_WRITE_COMMAND 0x0A
@@ -28,10 +30,10 @@ struct adxl367_spi_state {
struct spi_transfer fifo_xfer[2];
/*
- * DMA (thus cache coherency maintenance) requires the
- * transfer buffers to live in their own cache lines.
+ * DMA (thus cache coherency maintenance) may require the
+ * transfer buffers live in their own cache lines.
*/
- u8 reg_write_tx_buf[1] ____cacheline_aligned;
+ u8 reg_write_tx_buf[1] __aligned(IIO_DMA_MINALIGN);
u8 reg_read_tx_buf[2];
u8 fifo_tx_buf[1];
};
--
2.35.1
